Reference-coding with XERJ. Clone the libraries that already solved your problem, index them locally, and retrieve the exact implementation before writing code — so the agent reads passages instead of re-deriving algorithms across retry loops. Use when starting a task in an unfamiliar API, porting an algorithm, or when you have already looped twice on the same error.
Install
npx skills add xerj-org/xerj --skill xerj-codenpx skills add xerj-org/xerj --skill xerj-code -a claude-code -gnpx skills add xerj-org/xerj --skill xerj-code -a codex -ggemini skills install https://github.com/xerj-org/xerj.git --path tools/xerj-codegh skill install xerj-org/xerj xerj-codegit clone --depth 1 https://github.com/xerj-org/xerj /tmp/xerj-org__xerj
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/xerj-org__xerj/tools/xerj-code ~/.claude/skills/xerj-code # Claude Code
cp -R /tmp/xerj-org__xerj/tools/xerj-code ~/.agents/skills/xerj-code # Codex, Cursor, Gemini CLI, Copilot, OpenCode